Synchronized modifications to the variables used for condition signalling within Waiter.
fixes for Waiter race condition
added a test for Waiter race fix to AsyncAssertionsSpec
Changed public field left of Equalizer and CheckindEqualizer to leftSide so that it
doesn't conflict with a left method added implicitly by scalaz.
Fixed typos in HTML in Runner and ant task docs.
Merge branch 'waiter-race-fix2' of https://github.com/ndwade/scalatest
Added WaiterSpec.